:root {
  --ink: #162033;
  --muted: #647084;
  --line: #dce3eb;
  --surface: #ffffff;
  --soft: #f5f7fa;
  --primary: #174d8f;
  --primary-dark: #0d376a;
  --accent: #60796f;
  --shadow: 0 20px 45px rgba(22, 32, 51, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

body.nav-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(220, 227, 235, 0.82);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  gap: 26px;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a {
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--primary);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--primary);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.section {
  padding: 96px clamp(20px, 6vw, 88px);
  scroll-margin-top: 86px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 430px);
  gap: clamp(36px, 7vw, 90px);
  align-items: center;
  min-height: 100vh;
  padding-top: 120px;
  background: linear-gradient(180deg, #f7f9fc 0%, #ffffff 72%);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(44px, 7vw, 86px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.hero-title {
  margin-bottom: 18px;
  color: var(--primary);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
}

.hero-copy,
.lead {
  color: #334155;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  font-weight: 800;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(23, 77, 143, 0.16);
}

.button.primary {
  color: #fff;
  background: var(--primary);
}

.button.primary:hover {
  background: var(--primary-dark);
}

.button.secondary {
  color: var(--primary);
  background: transparent;
}

.portrait-panel {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.portrait-panel img {
  width: 100%;
  aspect-ratio: 1 / 1.08;
  object-fit: cover;
  object-position: center top;
}

.portrait-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  color: var(--muted);
}

.portrait-meta strong {
  color: var(--primary);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 42px;
  align-items: start;
}

.info-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.info-list div {
  min-height: 98px;
  padding: 20px;
  background: var(--surface);
}

.info-list dt {
  color: var(--muted);
  font-size: 13px;
}

.info-list dd {
  margin: 6px 0 0;
  font-weight: 800;
}

.skills,
.education,
.contact {
  background: var(--soft);
}

.skill-grid,
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.skill-card,
.portfolio-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.skill-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.skill-top span,
.portfolio-card span {
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
}

.meter {
  height: 8px;
  margin: 12px 0 16px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7edf3;
}

.meter span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.certificate-line {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  max-width: 520px;
  margin-top: 22px;
  padding: 16px 18px;
  border-left: 4px solid var(--primary);
  background: var(--surface);
}

.certificate-line span {
  color: var(--muted);
}

.timeline {
  border-left: 2px solid var(--line);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 28px;
  padding: 0 0 0 28px;
}

.timeline-item::before {
  position: absolute;
  top: 5px;
  left: -7px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--primary);
  border-radius: 50%;
  background: var(--surface);
  content: "";
}

.timeline-item time {
  color: var(--primary);
  font-weight: 800;
}

.education-panel,
.contact-panel {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 28px;
  align-items: center;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.education-panel img {
  width: 120px;
  height: 120px;
  object-fit: contain;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.tag-row span {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--primary);
  background: #f8fafc;
  font-size: 13px;
  font-weight: 700;
}

.portfolio-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.portfolio-card {
  min-height: 230px;
}

.portfolio-card a {
  color: var(--primary);
  font-weight: 800;
}

blockquote {
  margin: 28px 0 0;
  padding: 22px 26px;
  border-left: 4px solid var(--accent);
  color: #273449;
  background: var(--soft);
  font-size: 20px;
  font-weight: 800;
}

.contact-panel {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
}

.contact-links {
  display: grid;
  gap: 12px;
}

.contact-links a,
.contact-links span {
  display: block;
  overflow-wrap: anywhere;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfe;
}

.contact-links a:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.float-resume,
.back-to-top {
  position: fixed;
  right: 22px;
  z-index: 15;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(22, 32, 51, 0.18);
}

.float-resume {
  bottom: 88px;
  color: #fff;
  background: var(--primary);
  font-size: 13px;
  font-weight: 900;
}

.back-to-top {
  bottom: 28px;
  border: 0;
  color: var(--primary);
  background: var(--surface);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover,
.float-resume:hover {
  transform: translateY(-2px);
}

.site-footer {
  padding: 28px 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .hero,
  .split-layout,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .portrait-panel {
    max-width: 430px;
  }

  .skill-grid,
  .portfolio-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-header {
    height: 64px;
    padding-inline: 16px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    right: 16px;
    left: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  body.nav-open .site-nav {
    display: flex;
  }

  .site-nav a {
    padding: 12px;
  }

  .section {
    padding: 76px 18px;
    scroll-margin-top: 74px;
  }

  .hero {
    padding-top: 96px;
  }

  .info-list,
  .skill-grid,
  .portfolio-grid,
  .timeline-item,
  .education-panel {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    gap: 8px;
  }

  .education-panel {
    justify-items: start;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .float-resume,
  .back-to-top {
    right: 16px;
  }
}